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DLVR-L30D Datasheet(Fiches technique) 5 Page - All Sensors Corporation

Numéro de pièce DLVR-L30D
Description  DLVR Series Low Voltage Digital Pressure Sensors
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Fabricant  ASC [All Sensors Corporation]
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All Sensors
DS-0300 Rev A
Operation Overview
The DLVR is a digital sensor with a signal path that includes a sensing element, a 14 bit analog to digital converter, a DSP and
an IO block that supports either an I2C or SPI interface (see Figure 1 below). The sensor also includes an internal temperature
reference and associated control logic to support the configured operating mode. The sensing element is powered down
while not being sampled to conserve power. Since there is a single ADC, there is also a multiplexer at the front end of the
ADC that selects the signal source for the ADC.
Figure 1 - DLVR Essential Model
The ADC performs conversions on the raw sensor signal (P), the temperature reference (T) and a zero reference (Z) during an
ADC zero cycle. It also has an oversampling mode for a noise reduced output. A conversion cycle that is mesuring pressure
is called a Normal cycle. A cycle where either a temperature measurement or zeroing is being performed is called a Special
The DSP receives the converted pressure and temperature information and applies a multi-order transfer function to
compensate the pressure output. This transfer function includes compensation for span, offset, temperature effects of span,
temperature effects of offset and second order temperautre effects of both span and offset. There is also linearity compensa-
tion for gage devices and front to back linearity compensation for differential devices.
There are two effective operating modes of the sensor 1) Free Running and 2) Triggered. The control logic performs the
synchronization of the internal functions according the factory programmed Power/Speed option (see Table 1). The Control
Logic also determines the Delay between ADC samples, the regularity of the Special cycles and whether or not the ADC per-
forms the Over Sampling. Refer to Figure 2 for the communication model associated with the operating modes listed below.
Free Running Mode: In the free running mode, conversion cycles are initiated internally at regular intervals. There are
three options available that operate in the Free Running mode (F, N and L). Two of these (F and N) run continuously while
the third option (L) has an approximate 6 ms delay between conversion cycles. All three options have Special cycles
inserted at regular intervals to accomplish the ADC zeroing and temperature measurements. Two of the options utilize
oversampling. Refer to Table 1 for specific option controls.
Triggered Mode: In the Triggered Mode, a conversion cycle is initiated by the user (or host uP). There are two availabe
methods to wake the sensor from sleep mode. The first method (Wake All) is to wake the sensor and perform all three
measurement cycles (Z, T and P). This provides completely fresh data from the sensor. The second method (Wake P) is
to wake the sensor from sleep and only perform the pressure measurement (P).When using this second method, it is up
to the user to interleave Wake All commands at regular intervals to ensure there is sufficiently up to date temperature
information. Also, the Wake Pressure method is only available from the I2C interface (not available using a SPI interface).
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